diff --git a/src/emucore/FBSurface.hxx b/src/emucore/FBSurface.hxx
index 67eaa86d2..d72ffdd64 100644
--- a/src/emucore/FBSurface.hxx
+++ b/src/emucore/FBSurface.hxx
@@ -323,7 +323,7 @@ class FBSurface
       This method should be called to reset the surface to empty
       pixels / colour black.
     */
-    virtual void invalidate() = 0;
+    virtual void invalidate() {};
 
     /**
       This method should be called to reset a surface area to empty
diff --git a/src/gui/Dialog.cxx b/src/gui/Dialog.cxx
index c691c545a..f519cdadc 100644
--- a/src/gui/Dialog.cxx
+++ b/src/gui/Dialog.cxx
@@ -49,9 +49,9 @@ Dialog::Dialog(OSystem& instance, DialogContainer& parent, const GUI::Font& font
                const string& title, int x, int y, int w, int h)
   : GuiObject(instance, parent, *this, x, y, w, h),
     _font(font),
-    _title(title),
-    _flags(Widget::FLAG_ENABLED | Widget::FLAG_BORDER | Widget::FLAG_CLEARBG)
+    _title(title)
 {
+  _flags = Widget::FLAG_ENABLED | Widget::FLAG_BORDER | Widget::FLAG_CLEARBG;
   setTitle(title);
 }
 
@@ -411,14 +411,14 @@ void Dialog::drawDialog()
       || (parent().myDialogStack.get(parent().myDialogStack.size() - 2) == this
           && !parent().myDialogStack.top()->hasTitle());
 
-    if(_flags & Widget::FLAG_CLEARBG)
+    if(clearsBackground())
     {
       //    cerr << "Dialog::drawDialog(): w = " << _w << ", h = " << _h << " @ " << &s << endl << endl;
 
-      if(_flags & Widget::FLAG_TRANSPARENT)
-        s.invalidateRect(_x, _y + _th, _w, _h - _th);
-      else
+      if(hasBackground())
         s.fillRect(_x, _y + _th, _w, _h - _th, _onTop ? kDlgColor : kBGColorLo);
+      else
+        s.invalidateRect(_x, _y + _th, _w, _h - _th);
       if(_th)
       {
         s.fillRect(_x, _y, _w, _th, _onTop ? kColorTitleBar : kColorTitleBarLo);
@@ -431,7 +431,7 @@ void Dialog::drawDialog()
       s.invalidate();
       cerr << "invalidate " << typeid(*this).name() << endl;
     }
-    if(_flags & Widget::FLAG_BORDER) // currently only used by Dialog itself
+    if(hasBorder()) // currently only used by Dialog itself
       s.frameRect(_x, _y, _w, _h, _onTop ? kColor : kShadowColor);
 
     // Make all child widgets dirty
diff --git a/src/gui/Dialog.hxx b/src/gui/Dialog.hxx
index 805522c42..d9b750ab6 100644
--- a/src/gui/Dialog.hxx
+++ b/src/gui/Dialog.hxx
@@ -90,10 +90,6 @@ class Dialog : public GuiObject
     */
     void addSurface(const shared_ptr<FBSurface>& surface);
 
-    void setFlags(int flags) { _flags |= flags;  setDirty(); }
-    void clearFlags(int flags) { _flags &= ~flags; setDirty(); }
-    int  getFlags() const { return _flags; }
-
     void setTitle(const string& title);
     bool hasTitle() { return !_title.empty(); }
 
@@ -235,8 +231,6 @@ class Dialog : public GuiObject
     shared_ptr<FBSurface> _surface;
 
     int _tabID{0};
-    int _flags{0};
-    //bool _dirty{false};
     uInt32 _max_w{0}; // maximum wanted width
     uInt32 _max_h{0}; // maximum wanted height
 
diff --git a/src/gui/GuiObject.hxx b/src/gui/GuiObject.hxx
index 2f4a5c1ca..3bb510a6b 100644
--- a/src/gui/GuiObject.hxx
+++ b/src/gui/GuiObject.hxx
@@ -41,6 +41,20 @@ class GuiObject : public CommandReceiver
   friend class Widget;
   friend class DialogContainer;
 
+  public:
+    enum : uInt32 {
+      FLAG_ENABLED = 1 << 0,
+      FLAG_INVISIBLE = 1 << 1,
+      FLAG_HILITED = 1 << 2,
+      FLAG_BORDER = 1 << 3,
+      FLAG_CLEARBG = 1 << 4,
+      FLAG_TRACK_MOUSE = 1 << 5,
+      FLAG_RETAIN_FOCUS = 1 << 6,
+      FLAG_WANTS_TAB = 1 << 7,
+      FLAG_WANTS_RAWDATA = 1 << 8,
+      FLAG_NOBG = 1 << 9
+    };
+
   public:
     // The commands generated by various widgets
     enum {
@@ -83,6 +97,14 @@ class GuiObject : public CommandReceiver
     virtual bool isChainDirty() const = 0;
     virtual bool needsRedraw() const { return isDirty() || isChainDirty(); };
 
+    void setFlags(uInt32 flags) { _flags |= flags; setDirty(); }
+    void clearFlags(uInt32 flags) { _flags &= ~flags; setDirty(); }
+    uInt32 getFlags() const { return _flags; }
+
+    bool hasBorder() const { return _flags & FLAG_BORDER; }
+    bool clearsBackground() const { return _flags & FLAG_CLEARBG; }
+    bool hasBackground() const { return !(_flags & FLAG_NOBG); }
+
     /** Add given widget(s) to the focus list */
     virtual void addFocusWidget(Widget* w) = 0;
     virtual void addToFocusList(WidgetArray& list) = 0;
@@ -107,10 +129,11 @@ class GuiObject : public CommandReceiver
     Dialog&          myDialog;
 
   protected:
-    int _x{0}, _y{0}, _w{0}, _h{0};
-    bool _dirty{false};
+    int         _x{0}, _y{0}, _w{0}, _h{0};
+    bool        _dirty{false};
+    uInt32      _flags{0};
 
-    Widget* _firstWidget{nullptr};
+    Widget*     _firstWidget{nullptr};
     WidgetArray _focusList;
 
   private:
diff --git a/src/gui/TimeLineWidget.cxx b/src/gui/TimeLineWidget.cxx
index 94c4d3ef9..4e6b9e9a0 100644
--- a/src/gui/TimeLineWidget.cxx
+++ b/src/gui/TimeLineWidget.cxx
@@ -36,10 +36,9 @@ TimeLineWidget::TimeLineWidget(GuiObject* boss, const GUI::Font& font,
     _labelWidth(labelWidth)
 {
   _flags = Widget::FLAG_ENABLED | Widget::FLAG_TRACK_MOUSE
-    | Widget::FLAG_CLEARBG | Widget::FLAG_TRANSPARENT;
+    | Widget::FLAG_CLEARBG | Widget::FLAG_NOBG;
 
   _bgcolor = kDlgColor;
-  //_bgcolor = kBGColor;
   _bgcolorhi = kDlgColor;
 
   if(!_label.empty() && _labelWidth == 0)
diff --git a/src/gui/TimeMachineDialog.cxx b/src/gui/TimeMachineDialog.cxx
index 5982ba693..e822504a9 100644
--- a/src/gui/TimeMachineDialog.cxx
+++ b/src/gui/TimeMachineDialog.cxx
@@ -218,6 +218,7 @@ TimeMachineDialog::TimeMachineDialog(OSystem& osystem, DialogContainer& parent,
 
   this->clearFlags(Widget::FLAG_CLEARBG); // does only work combined with blending (0..100)!
   this->clearFlags(Widget::FLAG_BORDER);
+  this->setFlags(Widget::FLAG_NOBG);
 
   xpos = H_BORDER;
   ypos = V_BORDER;
@@ -225,9 +226,10 @@ TimeMachineDialog::TimeMachineDialog(OSystem& osystem, DialogContainer& parent,
   // Add index info
   myCurrentIdxWidget = new StaticTextWidget(this, font, xpos, ypos, "1000", TextAlign::Left, kBGColor);
   myCurrentIdxWidget->setTextColor(kColorInfo);
-  myCurrentIdxWidget->setFlags(Widget::FLAG_CLEARBG | Widget::FLAG_TRANSPARENT);
+  myCurrentIdxWidget->setFlags(Widget::FLAG_CLEARBG | Widget::FLAG_NOBG);
   myLastIdxWidget = new StaticTextWidget(this, font, _w - H_BORDER - font.getStringWidth("1000"), ypos,
                                          "1000", TextAlign::Right, kBGColor);
+  myLastIdxWidget->setFlags(Widget::FLAG_CLEARBG | Widget::FLAG_NOBG);
   myLastIdxWidget->setTextColor(kColorInfo);
 
   // Add timeline
@@ -242,10 +244,11 @@ TimeMachineDialog::TimeMachineDialog(OSystem& osystem, DialogContainer& parent,
   // Add time info
   int ypos_s = ypos + (buttonHeight - font.getFontHeight() + 1) / 2; // align to button vertical center
   myCurrentTimeWidget = new StaticTextWidget(this, font, xpos, ypos_s, "00:00.00", TextAlign::Left, kBGColor);
-  myCurrentTimeWidget->setFlags(Widget::FLAG_CLEARBG | Widget::FLAG_TRANSPARENT);
+  myCurrentTimeWidget->setFlags(Widget::FLAG_CLEARBG | Widget::FLAG_NOBG);
   myCurrentTimeWidget->setTextColor(kColorInfo);
   myLastTimeWidget = new StaticTextWidget(this, font, _w - H_BORDER - font.getStringWidth("00:00.00"), ypos_s,
                                           "00:00.00", TextAlign::Right, kBGColor);
+  myLastTimeWidget->setFlags(Widget::FLAG_CLEARBG | Widget::FLAG_NOBG);
   myLastTimeWidget->setTextColor(kColorInfo);
   xpos = myCurrentTimeWidget->getRight() + BUTTON_GAP * 4;
 
@@ -289,7 +292,7 @@ TimeMachineDialog::TimeMachineDialog(OSystem& osystem, DialogContainer& parent,
   // Add message
   myMessageWidget = new StaticTextWidget(this, font, xpos, ypos_s,
       "                                             ", TextAlign::Left, kBGColor);
-  myMessageWidget->setFlags(Widget::FLAG_CLEARBG | Widget::FLAG_TRANSPARENT);
+  myMessageWidget->setFlags(Widget::FLAG_CLEARBG | Widget::FLAG_NOBG);
   myMessageWidget->setTextColor(kColorInfo);
 }
 
diff --git a/src/gui/Widget.cxx b/src/gui/Widget.cxx
index 3c0252688..6358808e7 100644
--- a/src/gui/Widget.cxx
+++ b/src/gui/Widget.cxx
@@ -106,8 +106,6 @@ void Widget::draw()
     FBSurface& s = _boss->dialog().surface();
 
     bool onTop = _boss->dialog().isOnTop();
-
-    bool hasBorder = _flags & Widget::FLAG_BORDER; // currently only used by Dialog widget
     int oldX = _x, oldY = _y;
 
     // Account for our relative position in the dialog
@@ -115,23 +113,29 @@ void Widget::draw()
     _y = getAbsY();
 
     // Clear background (unless alpha blending is enabled)
-    if(_flags & Widget::FLAG_CLEARBG)
+    if(clearsBackground())
     {
       int x = _x, y = _y, w = _w, h = _h;
-      if(hasBorder)
+      if(hasBorder())
       {
         x++; y++; w -= 2; h -= 2;
       }
-      if(isTransparent())
-        s.invalidateRect(x, y, w, h);
+      if(hasBackground())
+        s.fillRect(x, y, w, h, !onTop
+                   ? _bgcolorlo
+                   : (_flags & Widget::FLAG_HILITED) && isEnabled()
+                   ? _bgcolorhi : _bgcolor);
       else
-        s.fillRect(x, y, w, h, !onTop ? _bgcolorlo : (_flags & Widget::FLAG_HILITED) && isEnabled() ? _bgcolorhi : _bgcolor);
+        s.invalidateRect(x, y, w, h);
     }
 
     // Draw border
-    if(hasBorder)
+    if(hasBorder())
     {
-      s.frameRect(_x, _y, _w, _h, !onTop ? kColor : (_flags & Widget::FLAG_HILITED) && isEnabled() ? kWidColorHi : kColor);
+      s.frameRect(_x, _y, _w, _h, !onTop
+                  ? kColor
+                  : (_flags & Widget::FLAG_HILITED) && isEnabled()
+                  ? kWidColorHi : kColor);
       _x += 4;
       _y += 4;
       _w -= 8;
@@ -142,7 +146,7 @@ void Widget::draw()
     drawWidget((_flags & Widget::FLAG_HILITED) ? true : false);
 
     // Restore x/y
-    if(hasBorder)
+    if(hasBorder())
     {
       _x -= 4;
       _y -= 4;
@@ -350,6 +354,7 @@ StaticTextWidget::StaticTextWidget(GuiObject* boss, const GUI::Font& font,
     _align(align)
 {
   _flags = Widget::FLAG_ENABLED;
+
   _bgcolor = kDlgColor;
   _bgcolorhi = kDlgColor;
   _textcolor = kTextColor;
@@ -692,7 +697,7 @@ SliderWidget::SliderWidget(GuiObject* boss, const GUI::Font& font,
     _valueLabelWidth(valueLabelWidth),
     _forceLabelSign(forceLabelSign)
 {
-  _flags = Widget::FLAG_ENABLED | Widget::FLAG_TRACK_MOUSE | Widget::FLAG_CLEARBG;;
+  _flags = Widget::FLAG_ENABLED | Widget::FLAG_TRACK_MOUSE | Widget::FLAG_CLEARBG;
   _bgcolor = kDlgColor;
   _bgcolorhi = kDlgColor;
 
diff --git a/src/gui/Widget.hxx b/src/gui/Widget.hxx
index 15e7a1d9c..270f1eb32 100644
--- a/src/gui/Widget.hxx
+++ b/src/gui/Widget.hxx
@@ -42,20 +42,6 @@ class Widget : public GuiObject
 {
   friend class Dialog;
 
-  public:
-    enum : uInt32 {
-      FLAG_ENABLED       = 1 << 0,
-      FLAG_INVISIBLE     = 1 << 1,
-      FLAG_HILITED       = 1 << 2,
-      FLAG_BORDER        = 1 << 3,
-      FLAG_CLEARBG       = 1 << 4,
-      FLAG_TRACK_MOUSE   = 1 << 5,
-      FLAG_RETAIN_FOCUS  = 1 << 6,
-      FLAG_WANTS_TAB     = 1 << 7,
-      FLAG_WANTS_RAWDATA = 1 << 8,
-      FLAG_TRANSPARENT   = 1 << 9
-    };
-
   public:
     Widget(GuiObject* boss, const GUI::Font& font, int x, int y, int w, int h);
     ~Widget() override;
@@ -97,16 +83,11 @@ class Widget : public GuiObject
     /** Set/clear FLAG_ENABLED */
     void setEnabled(bool e);
 
-    void setFlags(uInt32 flags)    { _flags |= flags;  setDirty(); }
-    void clearFlags(uInt32 flags)  { _flags &= ~flags; setDirty(); }
-    uInt32 getFlags() const        { return _flags; }
-
     bool isEnabled() const          { return _flags & FLAG_ENABLED;         }
     bool isVisible() const override { return !(_flags & FLAG_INVISIBLE);    }
     virtual bool wantsFocus() const { return _flags & FLAG_RETAIN_FOCUS;    }
     bool wantsTab() const           { return _flags & FLAG_WANTS_TAB;       }
     bool wantsRaw() const           { return _flags & FLAG_WANTS_RAWDATA;   }
-    bool isTransparent() const      { return _flags & FLAG_TRANSPARENT;     }
 
     void setID(uInt32 id) { _id = id;   }
     uInt32 getID() const  { return _id; }
@@ -140,7 +121,6 @@ class Widget : public GuiObject
     const GUI::Font& _font;
     Widget*    _next{nullptr};
     uInt32     _id{0};
-    uInt32     _flags{0};
     bool       _hasFocus{false};
     int        _fontWidth{0};
     int        _lineHeight{0};
diff --git a/src/libretro/FBSurfaceLIBRETRO.hxx b/src/libretro/FBSurfaceLIBRETRO.hxx
index 646d2c46c..3918ff673 100644
--- a/src/libretro/FBSurfaceLIBRETRO.hxx
+++ b/src/libretro/FBSurfaceLIBRETRO.hxx
@@ -51,6 +51,7 @@ class FBSurfaceLIBRETRO : public FBSurface
     void translateCoords(Int32& x, Int32& y) const override { }
     bool render() override { return true; }
     void invalidate() override { }
+    void invalidateRect(uInt32, uInt32, uInt32, uInt32) override { }
     void free() override { }
     void reload() override { }
     void resize(uInt32 width, uInt32 height) override { }